Average Error: 0.2 → 0.0
Time: 4.2s
Precision: binary64
\[\left({\left(a \cdot a + b \cdot b\right)}^{2} + 4 \cdot \left(\left(a \cdot a\right) \cdot \left(1 - a\right) + \left(b \cdot b\right) \cdot \left(3 + a\right)\right)\right) - 1 \]
↓
\[\left({a}^{4} + \mathsf{fma}\left(b \cdot b, \mathsf{fma}\left(2, a \cdot a, 12 + a \cdot 4\right), \mathsf{fma}\left(a \cdot a, 4 - a \cdot 4, {b}^{4}\right)\right)\right) - 1 \]
(FPCore (a b)
 :precision binary64
 (-
  (+
   (pow (+ (* a a) (* b b)) 2.0)
   (* 4.0 (+ (* (* a a) (- 1.0 a)) (* (* b b) (+ 3.0 a)))))
  1.0))
↓
(FPCore (a b)
 :precision binary64
 (-
  (+
   (pow a 4.0)
   (fma
    (* b b)
    (fma 2.0 (* a a) (+ 12.0 (* a 4.0)))
    (fma (* a a) (- 4.0 (* a 4.0)) (pow b 4.0))))
  1.0))
double code(double a, double b) {
	return (pow(((a * a) + (b * b)), 2.0) + (4.0 * (((a * a) * (1.0 - a)) + ((b * b) * (3.0 + a))))) - 1.0;
}
↓
double code(double a, double b) {
	return (pow(a, 4.0) + fma((b * b), fma(2.0, (a * a), (12.0 + (a * 4.0))), fma((a * a), (4.0 - (a * 4.0)), pow(b, 4.0)))) - 1.0;
}

function code(a, b)
	return Float64(Float64((Float64(Float64(a * a) + Float64(b * b)) ^ 2.0) + Float64(4.0 * Float64(Float64(Float64(a * a) * Float64(1.0 - a)) + Float64(Float64(b * b) * Float64(3.0 + a))))) - 1.0)
end
↓
function code(a, b)
	return Float64(Float64((a ^ 4.0) + fma(Float64(b * b), fma(2.0, Float64(a * a), Float64(12.0 + Float64(a * 4.0))), fma(Float64(a * a), Float64(4.0 - Float64(a * 4.0)), (b ^ 4.0)))) - 1.0)
end

code[a_, b_] := N[(N[(N[Power[N[(N[(a * a), $MachinePrecision] + N[(b * b), $MachinePrecision]), $MachinePrecision], 2.0], $MachinePrecision] + N[(4.0 * N[(N[(N[(a * a), $MachinePrecision] * N[(1.0 - a), $MachinePrecision]), $MachinePrecision] + N[(N[(b * b), $MachinePrecision] * N[(3.0 + a), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] - 1.0), $MachinePrecision]
↓
code[a_, b_] := N[(N[(N[Power[a, 4.0], $MachinePrecision] + N[(N[(b * b), $MachinePrecision] * N[(2.0 * N[(a * a), $MachinePrecision] + N[(12.0 + N[(a * 4.0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] + N[(N[(a * a), $MachinePrecision] * N[(4.0 - N[(a * 4.0), $MachinePrecision]), $MachinePrecision] + N[Power[b, 4.0], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] - 1.0), $MachinePrecision]

\left({\left(a \cdot a + b \cdot b\right)}^{2} + 4 \cdot \left(\left(a \cdot a\right) \cdot \left(1 - a\right) + \left(b \cdot b\right) \cdot \left(3 + a\right)\right)\right) - 1
↓
\left({a}^{4} + \mathsf{fma}\left(b \cdot b, \mathsf{fma}\left(2, a \cdot a, 12 + a \cdot 4\right), \mathsf{fma}\left(a \cdot a, 4 - a \cdot 4, {b}^{4}\right)\right)\right) - 1

Error

Derivation

  1. Initial program 0.2

    \[\left({\left(a \cdot a + b \cdot b\right)}^{2} + 4 \cdot \left(\left(a \cdot a\right) \cdot \left(1 - a\right) + \left(b \cdot b\right) \cdot \left(3 + a\right)\right)\right) - 1 \]

  2. Taylor expanded in a around 0 0.0

    \[\leadsto \left(\color{blue}{\left(2 \cdot \left({a}^{2} \cdot {b}^{2}\right) + \left({a}^{4} + {b}^{4}\right)\right)} + 4 \cdot \left(\left(a \cdot a\right) \cdot \left(1 - a\right) + \left(b \cdot b\right) \cdot \left(3 + a\right)\right)\right) - 1 \]

  3. Simplified0.0

    \[\leadsto \left(\color{blue}{\mathsf{fma}\left(2, \left(b \cdot b\right) \cdot \left(a \cdot a\right), {b}^{4} + {a}^{4}\right)} + 4 \cdot \left(\left(a \cdot a\right) \cdot \left(1 - a\right) + \left(b \cdot b\right) \cdot \left(3 + a\right)\right)\right) - 1 \]

  4. Taylor expanded in b around 0 0.0

    \[\leadsto \color{blue}{\left(\left(2 \cdot {a}^{2} + 4 \cdot \left(3 + a\right)\right) \cdot {b}^{2} + \left({b}^{4} + \left({a}^{4} + 4 \cdot \left({a}^{2} \cdot \left(1 - a\right)\right)\right)\right)\right)} - 1 \]

  5. Simplified0.0

    \[\leadsto \color{blue}{\left({a}^{4} + \mathsf{fma}\left(b \cdot b, \mathsf{fma}\left(2, a \cdot a, 12 + a \cdot 4\right), \mathsf{fma}\left(a \cdot a, 4 - a \cdot 4, {b}^{4}\right)\right)\right)} - 1 \]

  6. Final simplification0.0

    \[\leadsto \left({a}^{4} + \mathsf{fma}\left(b \cdot b, \mathsf{fma}\left(2, a \cdot a, 12 + a \cdot 4\right), \mathsf{fma}\left(a \cdot a, 4 - a \cdot 4, {b}^{4}\right)\right)\right) - 1 \]

Reproduce

herbie shell --seed 2022203 
(FPCore (a b)
  :name "Bouland and Aaronson, Equation (24)"
  :precision binary64
  (- (+ (pow (+ (* a a) (* b b)) 2.0) (* 4.0 (+ (* (* a a) (- 1.0 a)) (* (* b b) (+ 3.0 a))))) 1.0))